"Whoah, Nee-san, long time no see!" Reo, who was glancing from the backroom before, came straight to the entrance, and hugged the unexpected guest quite passionately, adding to the group's confusion.

It wasn't anything new for Reo to call older girls "Nee-san", but long time no see? And, obviously, no one walks around giving out hugs this affectionate.

So, this time, it was Kiyoko's time to get surprised.

"You two... know each other?"

Apparently, Hokusai shared the sentiment.

"More than just know, in fact!" Reo winked mischievously, looking quite proud of himself.

What came as another wave of shock was the way Kou hugged him back and went as far as to kiss him lightly on the cheek. After all, what was the harm since Ann had a day off today?

"We were dating each other some time ago", she said, chuckling.

"The way you act now I'd say you still do", poor Zen looked so puzzled that brought another wave of laughter, both from Kou and Reo.

"'Tis nothing more than a friendly gesture, though~", Maruyama didn't hesitate to give the brunette a quick squeeze before releasing her.

"Indeed it is~", Kou mimicked her friend, and both looked at each other, grinning knowingly.

Before Kiyoko could ask what were they planning — she absolutely knew they were, because that glint in her sister's eyes couldn't mean anything good — the pair had already achieved their goal.

"Y-y-you pervs! Why ya doin' this if you broke up?! It's beyond i-improper! It's vulgar!"

"Awww, is Satsuki-kun embarrassed? —"

"—It seems you're still a kid, then~"

They seemed to be in perfect sync, and it wouldn’t be hard to believe they were still a couple.

Even Kiyo herself could easily believe it if she didn't know for a fact who her sis was "playing with" nowadays.

"... though, I had no idea you even knew each other", she said, pouting. It was more of a joke than anything, really, but Kiyoko couldn't deny she wished her sister told her about knowing Reo. Or?..

"I wanted to, but it was when you were busy... with something else", Kou retorted with a shy smile — an indicator that "something else" was an uncomfortable topic to discuss here and now.

"Well, 'tis an unexpected development, 'innit?" Finally, Iori bumped into the conversation with a lighthearted laugh. "Guess we all are equal now, no? Knowing each other's secrets and all."